A cathepsin F of adult Clonorchis sinensis and its phylogenetic conservation in trematodes

T. H. Kang, D. H. Yun, E. H.B. Lee, Y. B. Chung, Y. A. Bae, J. Y. Chung, I. Kang, J. Kim, S. Y. Cho, Y. Kong

    Research output: Contribution to journalArticlepeer-review

    34 Citations (Scopus)

    Abstract

    A novel 28 kDa cysteine protease (Cs28CF) secreted by the hepatobiliary trematode, Clonorchis sinensis was identified. The protease was purified from the excretory-secretory products (ESP) of the adult worm using DEAE-ion exchange and Arginine-Sepharose 4B chromatography. It showed a high activity between pH 6.5 and 7.5 in a dithiothreitol (DTT)-dependent manner. Inhibitors specific to cysteine proteases down-regulated the activity. Addition of Cs28CF to monkey cholangiocyte cultures resulted in approximately 95% cell death after 7 days. The full-length cDNA (1078 bp) encoded a single peptide of 328 amino acids (aa) with an N-terminal hydrophobic sequence, an ERFNAQ motif in the propeptide and a mature domain. Expression of mRNA transcripts of Cs28CF was observed in both the metacercaria and adult stages. Bacterially expressed recombinant protein exhibited a specific antibody reaction with clonorchiasis sera. Deduced aa exhibited 52-76% sequence identity with the cathepsin F analogues from other organisms. A novel E/DXGTA motif was recognized in the propeptide region. Phylogenetic analysis of 63 papain family members revealed that the trematode cysteine proteases formed 2 major clades of cathepsins F and L. The trematode cysteine proteases classified as cathepsin F shared higher homology among themselves than those classified as cathepsin L. Cathepsin F is phylogenetically conserved in the trematode parasites as well as in mammals.

    Original languageEnglish
    Pages (from-to)195-207
    Number of pages13
    JournalParasitology
    Volume128
    Issue number2
    DOIs
    Publication statusPublished - 2004 Feb

    Keywords

    • Cathepsin F
    • Clonorchis sinensis
    • E/DXGTA motif
    • ERFNAQ motif
    • Excretory-secretory cysteine protease
    • Recombinant antigen

    ASJC Scopus subject areas

    • Parasitology
    • Animal Science and Zoology
    • Infectious Diseases

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